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HENRY, CARNEGIE GARDEN, OF PARIS, FRANCE i Zeile/'s Palmi 1Y0. 65,542, (laterz Jmn: 11, 1567.

IMPROVEMENT itu MnTRoNoMrs.-

TO ALL WHOM I'l MAY CONCERN:

Be it known that I, HENRY CARNEGIE CAnDEN, oft Paris, in the Empire of France, have invented a neu, and useful improvement in the constructionof Metrouomes, or apparatus for measuring intervals of time; and I do hereby declare that the following isa full, clear, and exact description thereof, reference being:v had to the figures of the annexed drawing, making part of this specification, that is to say- A Myinvention consists in a novel combination of mechanism applied to the construction of the instruments knOWIl 21S mctrcnomea or apparatus for measuring intervals of time, and especially intended to mark at will, in music, the time of those notes only which are naturally accentuated.

Figure 1, of the accompanying drawings, is a front view of the mechanism.

Figure 2 is a vertical section of the same, (side view'.)

Figure 3 represents the indicator'plate.

In all these figures similar parts of the mechanism are indicated by: the same letters of reference.

a a a a are two plates enclosing the diierent parts ot" the apparatus, and separated from each other by the pillars b b b b. c is the suspension-plate ofthe pendulum-rod. dis a double or anchor-shaped lever, similar to that used in certain kinds of clocks. e is the escapement-irhecl carrying eighteen teeth. fis a ratchet wheel with nine teeth and nine spaces, mounted parallel tothe wheel e, the requiredseparation between the two faces being maintained by the pillars g y, by which both wheels are connected together. z la is an intermediate wheel cogging with the pinion z'of the. eseapemcnt e. jj is another toothed Wheel mounted on the barrel t k, in which is coiled the motive spring, as in ordinary time-kcepers. This wheel jj cogs with the pinion lof the intermediate wheel L. m is the arbor of the barrel-wheel. n is the arbor of the anchor d. o o o o are'the bearings of the dicrcnt arbors, formed in the back and front plates of the apparatus. pp is the pendulumrod. g is the fork. r, suspension of the pendulum-rod. s, suspension of the fork g. tis the arbor of the rocking-lever u, the upper or beak-shaped extremity of which acts on the ratchet-wheel f, while tothe lower extremity is secured a ne thread, u. fr, tig. 3, is a double plate, the parallel surfaces of which are separated by pivot columns to the distance of about one-fifth of an inch. y is the indicator, formed of any suitable light material, (such as the barb of a feather the stalk of which passes into the spiral spring z. The plate z r, fig 3, being placed in any required position, is connected by means of the thread v with. the foot oi' the rockinglever u of the main apparatus, figs. 1, 2. The main-spring enclosed in the barrel lc being wound up, thc motion is imparted to the wheels luf, and e, to the anchor d, the pendulum p, and the fork g. During this movement the rocking-lever u, cogging by its upper end on the ratchetm'heelf, draws backward and forward the thread v attached to its lower extremity, and communicates the required motion to the indicator y, which t'nns marks the time according to the rise and fall of the pendulum. When so desired, a pair of chimes or other sounding mechanism may be applied to the apparatus, and acted on by a crossbar or other equivalent arrangement attached to the pendulum-rod.

The apparatus constructed as above is, as before stated, especially intended for marking time in music, but it is obvious that by slight modifications in the details of form and arrangement, the same mechanism may be applied to the construction of alarm-clocks and other instruments for the measurement ot' intervals of time.

Having now described the nature oi my said invention, and the mannerol carrying it into effect, Ideelare that what I claim as my improvement in the construction of metronomes, and desire to protect by Letters Patent, is-

The combination of the ratchet-wheelf, mounted on an escape1uent-ivheel c, with the rocking-lever u, the thread c, and the spiral spring z, in manner and for thc purposes substantially as herein set forth and shown in the figures of the annexed drawing.

il'. C. GARDEN.

Witn ess es;

MF. il'lENNOUS, Pate/zt Solicitor, 2st Rue de Dunkerque, Paris. F L. THESEW, C'lcrt' to llfessrs. .Mentions j' de Telescie .Patent iSolz'ctors, Parts. 

